kasan: CONFIG_KASAN_INLINE enabled kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 8249 Comm: syz-executor2 Not tainted 4.19.0-rc4-next-20180921+ #77 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__fire_sched_out_preempt_notifiers kernel/sched/core.c:2502 [inline] RIP: 0010:fire_sched_out_preempt_notifiers kernel/sched/core.c:2510 [inline] RIP: 0010:prepare_task_switch kernel/sched/core.c:2616 [inline] RIP: 0010:context_switch kernel/sched/core.c:2795 [inline] RIP: 0010:__schedule+0x1144/0x1ed0 kernel/sched/core.c:3479 Code: 89 e0 48 c1 e8 03 42 80 3c 28 00 0f 85 7e 08 00 00 4d 8b 24 24 4d 85 e4 0f 84 7e f5 ff ff 49 8d 7c 24 10 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 a4 e8 e0 bb 00 fa eb 9d 48 8d bb 28 04 00 00 48 RSP: 0018:ffff88019229f188 EFLAGS: 00010806 RAX: 1bd5a00000000022 RBX: ffff8801be16c340 RCX: 1ffff100311ff937 RDX: 0000000040000002 RSI: 0000000000000000 RDI: dead000000000110 RBP: ffff88019229f360 R08: ffff880192278000 R09: fffff52001bf7e47 R10: fffff52001bf7e47 R11: ffffc9000dfbf23b R12: dead000000000100 R13: dffffc0000000000 R14: ffff8801dad2cc40 R15: ffff880192278000 FS: 00007f0f4bc81700(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000181bfd8 CR3: 00000001bc5ab000 CR4: 00000000001426e0 Call Trace: preempt_schedule_common+0x1f/0xd0 kernel/sched/core.c:3603 preempt_schedule+0x4d/0x60 kernel/sched/core.c:3629 ___preempt_schedule+0x16/0x18 on_each_cpu+0x1ab/0x1e0 kernel/smp.c:608 text_poke_bp+0x12b/0x1de arch/x86/kernel/alternative.c:816 __jump_label_transform.isra.0+0x478/0x8f0 arch/x86/kernel/jump_label.c:105 arch_jump_label_transform+0x2f/0x40 arch/x86/kernel/jump_label.c:113 __jump_label_update+0x16e/0x1a0 kernel/jump_label.c:380 jump_label_update+0x174/0x320 kernel/jump_label.c:765 __static_key_slow_dec_cpuslocked+0xbd/0x210 kernel/jump_label.c:210 __static_key_slow_dec kernel/jump_label.c:220 [inline] static_key_slow_dec+0x63/0xa0 kernel/jump_label.c:234 kvm_arch_vcpu_uninit+0x189/0x1c0 arch/x86/kvm/x86.c:8822 kvm_vcpu_uninit+0x44/0x90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:337 vmx_free_vcpu+0x23a/0x300 arch/x86/kvm/vmx.c:10947 kvm_arch_vcpu_free arch/x86/kvm/x86.c:8438 [inline] kvm_free_vcpus arch/x86/kvm/x86.c:8888 [inline] kvm_arch_destroy_vm+0x365/0x7c0 arch/x86/kvm/x86.c:8985 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:751 [inline] kvm_put_kvm+0x6c8/0xff0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:772 kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2406 __fput+0x3bc/0xa70 fs/file_table.c:279 ____fput+0x15/0x20 fs/file_table.c:312 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457679 Code: 1d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0f4bc80c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffea RBX: 00007f0f4bc816d4 RCX: 0000000000457679 RDX: 0000000020000040 RSI: 000000004080aebf RDI: 0000000000000005 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cfca0 R14: 00000000004bfdd6 R15: 0000000000000001 Modules linked in: ====================================================== WARNING: possible circular locking dependency detected 4.19.0-rc4-next-20180921+ #77 Not tainted ------------------------------------------------------ syz-executor2/8249 is trying to acquire lock: 00000000de82bb88 ((console_sem).lock){-...}, at: down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 but task is already holding lock: 000000007938bd68 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1125 [inline] 000000007938bd68 (&rq->lock){-.-.}, at: __schedule+0x236/0x1ed0 kernel/sched/core.c:3417 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #2 (&rq->lock){-.-.}: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2d/0x40 kernel/locking/spinlock.c:144 rq_lock kernel/sched/sched.h:1125 [inline] task_fork_fair+0xb0/0x6d0 kernel/sched/fair.c:9674 sched_fork+0x443/0xba0 kernel/sched/core.c:2358 copy_process+0x2585/0x8780 kernel/fork.c:1887 _do_fork+0x1cb/0x11c0 kernel/fork.c:2216 kernel_thread+0x34/0x40 kernel/fork.c:2275 rest_init+0x22/0xe5 init/main.c:408 start_kernel+0x8bc/0x8f7 init/main.c:739 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:452 x86_64_start_kernel+0x76/0x79 arch/x86/kernel/head64.c:433 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:242 -> #1 (&p->pi_lock){-.-.}: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152 try_to_wake_up+0xd2/0x12f0 kernel/sched/core.c:1964 wake_up_process+0x10/0x20 kernel/sched/core.c:2128 __up.isra.1+0x1c0/0x2a0 kernel/locking/semaphore.c:262 up+0x13c/0x1c0 kernel/locking/semaphore.c:187 __up_console_sem+0xbe/0x1b0 kernel/printk/printk.c:243 console_unlock+0x80c/0x1150 kernel/printk/printk.c:2426 vprintk_emit+0x33d/0x930 kernel/printk/printk.c:1921 vprintk_default+0x28/0x30 kernel/printk/printk.c:1962 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1995 check_stack_usage kernel/exit.c:755 [inline] do_exit.cold.19+0x5b/0x21f kernel/exit.c:916 do_group_exit+0x177/0x440 kernel/exit.c:970 __do_sys_exit_group kernel/exit.c:981 [inline] __se_sys_exit_group kernel/exit.c:979 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:979 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 ((console_sem).lock){-...}: lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3900 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:226 console_trylock+0x15/0xa0 kernel/printk/printk.c:2244 console_trylock_spinning kernel/printk/printk.c:1648 [inline] vprintk_emit+0x322/0x930 kernel/printk/printk.c:1920 vprintk_default+0x28/0x30 kernel/printk/printk.c:1962 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1995 kasan_die_handler.cold.22+0x11/0x30 arch/x86/mm/kasan_init_64.c:250 notifier_call_chain+0x17e/0x380 kernel/notifier.c:93 __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x96/0x190 kernel/notifier.c:193 notify_die+0x1bd/0x2d0 kernel/notifier.c:549 do_general_protection+0x25b/0x340 arch/x86/kernel/traps.c:573 general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1138 __fire_sched_out_preempt_notifiers kernel/sched/core.c:2502 [inline] fire_sched_out_preempt_notifiers kernel/sched/core.c:2510 [inline] prepare_task_switch kernel/sched/core.c:2616 [inline] context_switch kernel/sched/core.c:2795 [inline] __schedule+0x1144/0x1ed0 kernel/sched/core.c:3479 preempt_schedule_common+0x1f/0xd0 kernel/sched/core.c:3603 preempt_schedule+0x4d/0x60 kernel/sched/core.c:3629 ___preempt_schedule+0x16/0x18 on_each_cpu+0x1ab/0x1e0 kernel/smp.c:608 text_poke_bp+0x12b/0x1de arch/x86/kernel/alternative.c:816 __jump_label_transform.isra.0+0x478/0x8f0 arch/x86/kernel/jump_label.c:105 arch_jump_label_transform+0x2f/0x40 arch/x86/kernel/jump_label.c:113 __jump_label_update+0x16e/0x1a0 kernel/jump_label.c:380 jump_label_update+0x174/0x320 kernel/jump_label.c:765 __static_key_slow_dec_cpuslocked+0xbd/0x210 kernel/jump_label.c:210 __static_key_slow_dec kernel/jump_label.c:220 [inline] static_key_slow_dec+0x63/0xa0 kernel/jump_label.c:234 kvm_arch_vcpu_uninit+0x189/0x1c0 arch/x86/kvm/x86.c:8822 kvm_vcpu_uninit+0x44/0x90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:337 vmx_free_vcpu+0x23a/0x300 arch/x86/kvm/vmx.c:10947 kvm_arch_vcpu_free arch/x86/kvm/x86.c:8438 [inline] kvm_free_vcpus arch/x86/kvm/x86.c:8888 [inline] kvm_arch_destroy_vm+0x365/0x7c0 arch/x86/kvm/x86.c:8985 kvm_destroy_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:751 [inline] kvm_put_kvm+0x6c8/0xff0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:772 kvm_vcpu_release+0x7b/0xa0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2406 __fput+0x3bc/0xa70 fs/file_table.c:279 ____fput+0x15/0x20 fs/file_table.c:312 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x318/0x380 arch/x86/entry/common.c:166 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline] syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: (console_sem).lock --> &p->pi_lock --> &rq->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&rq->lock); lock(&p->pi_lock); lock(&rq->lock); lock((console_sem).lock); *** DEADLOCK *** 5 locks held by syz-executor2/8249: #0: 00000000e514a6ad (cpu_hotplug_lock.rw_sem){++++}, at: __static_key_slow_dec kernel/jump_label.c:219 [inline] #0: 00000000e514a6ad (cpu_hotplug_lock.rw_sem){++++}, at: static_key_slow_dec+0x57/0xa0 kernel/jump_label.c:234 #1: 00000000be8c872d (jump_label_mutex){+.+.}, at: __static_key_slow_dec_cpuslocked+0x87/0x210 kernel/jump_label.c:200 #2: 000000000cf21dd8 (text_mutex){+.+.}, at: arch_jump_label_transform+0x1b/0x40 arch/x86/kernel/jump_label.c:112 #3: 000000007938bd68 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1125 [inline] #3: 000000007938bd68 (&rq->lock){-.-.}, at: __schedule+0x236/0x1ed0 kernel/sched/core.c:3417 #4: 00000000add217b5 (rcu_read_lock){....}, at: atomic_notifier_call_chain+0x0/0x190 kernel/notifier.c:329 stack backtrace: CPU: 1 PID: 8249 Comm: syz-executor2 Not tainted 4.19.0-rc4-next-20180921+ #77 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1d3/0x2c4 lib/dump_stack.c:113 print_circular_bug.isra.33.cold.54+0x1bd/0x27d kernel/locking/lockdep.c:1221 check_prev_add kernel/locking/lockdep.c:1861 [inline] check_prevs_add kernel/locking/lockdep.c:1974 [inline] validate_chain kernel/locking/lockdep.c:2415 [inline] __lock_acquire+0x33e4/0x4ec0 kernel/locking/lockdep.c:3411 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3900 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x99/0xd0 kernel/locking/spinlock.c:152 down_trylock+0x13/0x70 kernel/locking/semaphore.c:136 __down_trylock_console_sem+0xae/0x200 kernel/printk/printk.c:226 console_trylock+0x15/0xa0 kernel/printk/printk.c:2244 console_trylock_spinning kernel/printk/printk.c:1648 [inline] vprintk_emit+0x322/0x930 kernel/printk/printk.c:1920 vprintk_default+0x28/0x30 kernel/printk/printk.c:1962 vprintk_func+0x7e/0x181 kernel/printk/printk_safe.c:398 printk+0xa7/0xcf kernel/printk/printk.c:1995 kasan_die_handler.cold.22+0x11/0x30 arch/x86/mm/kasan_init_64.c:250 notifier_call_chain+0x17e/0x380 kernel/notifier.c:93 __atomic_notifier_call_chain kernel/notifier.c:183 [inline] atomic_notifier_call_chain+0x96/0x190 kernel/notifier.c:193 notify_die+0x1bd/0x2d0 kernel/notifier.c:549 do_general_protection+0x25b/0x340 arch/x86/kernel/traps.c:573 general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1138 RIP: 0010:__fire_sched_out_preempt_notifiers kernel/sched/core.c:2502 [inline] RIP: 0010:fire_sched_out_preempt_notifiers kernel/sched/core.c:2510 [inline] RIP: 0010:prepare_task_switch kernel/sched/core.c:2616 [inline] RIP: 0010:context_switch kernel/sched/core.c:2795 [inline] RIP: 0010:__schedule+0x1144/0x1ed0 kernel/sched/core.c:3479 Code: 89 e0 48 c1 e8 03 42 80 3c 28 00 0f 85 7e 08 00 00 4d 8b 24 24 4d 85 e4 0f 84 7e f5 ff ff 49 8d 7c 24 10 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 a4 e8 e0 bb 00 fa eb 9d 48 8d bb 28 04 00 00 48 RSP: 0018:ffff88019229f188 EFLAGS: 00010806 RAX: 1bd5a00000000022 RBX: ffff8801be16c340 RCX: 1ffff100311ff937 RDX: 0000000040000002 RSI: 0000000000000000 RDI: dead000000000110 RBP: ffff88019229f360 R08: ffff880192278000 R09: fffff52001bf7e47 R10: fffff52001bf7e47 R11: ffffc9000dfbf23b R12: dead000000000100 R13: dffffc0000000000 R14: ffff8801dad2cc40 R15: ffff880192278000 preempt_schedule_common+0x1f/0xd0 kernel/sched/core.c:3603 preempt_schedule+0x4d/0x60 kernel/sched/core.c:3629 ___preempt_schedule+0x16/0x18 on_each_cpu+0x1ab/0x1e0 kernel/smp.c:608 text_poke_bp+0x12b/0x1de arch/x86/kernel/alternative.c:816 __jump_label_transform.isra.0+0x478/0x8f0 arch/x86/kernel/jump_label.c:105 arch_jump_label_transform+0x2f/0x40 arch/x86/kernel/jump_label.c:113 __jump_label_update+0x16e/0x1a0 kernel/jump_label.c:380 jump_label_update+0x174/0x320 kernel/jump_label.c:765 __static_key_slow_dec_cpuslocked+0xbd/0x210 kernel/jump_label.c:210 Lost 58 message(s)! ---[ end trace 3070f3f14725b9a5 ]--- RIP: 0010:__fire_sched_out_preempt_notifiers kernel/sched/core.c:2502 [inline] RIP: 0010:fire_sched_out_preempt_notifiers kernel/sched/core.c:2510 [inline] RIP: 0010:prepare_task_switch kernel/sched/core.c:2616 [inline] RIP: 0010:context_switch kernel/sched/core.c:2795 [inline] RIP: 0010:__schedule+0x1144/0x1ed0 kernel/sched/core.c:3479 Code: 89 e0 48 c1 e8 03 42 80 3c 28 00 0f 85 7e 08 00 00 4d 8b 24 24 4d 85 e4 0f 84 7e f5 ff ff 49 8d 7c 24 10 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00 74 a4 e8 e0 bb 00 fa eb 9d 48 8d bb 28 04 00 00 48 RSP: 0018:ffff88019229f188 EFLAGS: 00010806 RAX: 1bd5a00000000022 RBX: ffff8801be16c340 RCX: 1ffff100311ff937 RDX: 0000000040000002 RSI: 0000000000000000 RDI: dead000000000110 RBP: ffff88019229f360 R08: ffff880192278000 R09: fffff52001bf7e47 R10: fffff52001bf7e47 R11: ffffc9000dfbf23b R12: dead000000000100 R13: dffffc0000000000 R14: ffff8801dad2cc40 R15: ffff880192278000 FS: 00007f0f4bc81700(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000181bfd8 CR3: 00000001bc5ab000 CR4: 00000000001426e0